the Depends line in the control file of the package.
For example +!(TARGET_brcm47xx||TARGET_brcm63xx):kmod-ssb does not
result in kmod-ssb for the x86 target or any other target.
This fixes#6874
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20553 3c298f89-4303-0410-b956-a3cf2f4a3e73